| Value | Category | 
                                    
                    
                        | 1 | to a great extent | 
                                    
                    
                        | 2 | to a certain extent | 
                                    
                    
                        | 3 | to a very limited extent | 
                                    
                    
                        | 4 | not at all | 
                                    
                    
                        | 9 | no answer | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.